Real-time probe for the efficient sensing of inorganic fluoride and copper ions in aqueous media
Date
2018
Authors
Patil, P.
Ajeya, K.V.
Bhat, M.P.
Sriram, G.
Yu, J.
Jung, H.Y.
Altalhi, T.
Kigga, M.
Kurkuri, M.D.
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Journal article
Citation
ChemistrySelect, 2018; 3(41):11593-11600
Statement of Responsibility
Pravin Patil, Kanalli V. Ajeya, Mahesh P. Bhat, Ganesan Sriram, Jingxian Yu, Ho-Young Jung, Tariq Altalhi, Madhuprasad Kigga, and Mahaveer D. Kurkuri
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Abstract
A highly sensitive and efficient rhodamine 6G based probe (P3 ) was synthesized for the real‐time sensing of F⁻ and Cu²⁺ ions. The probe P3 was able to show significant color change from brown to pink in the presence of F⁻ and yellow to orange in presence of Cu²⁺ ions. The UV‐vis studies confirm that the probe P3 was able to detect F⁻ and Cu²⁺ ions over other ions. Further, UV‐vis titration studies were carried out to understand the detection mechanism and stoichiometry between P3 : F⁻ and P3 : Cu²⁺ ions. ¹H‐NMR titration was performed to confirm the F⁻ ion binding to probe P3 , where, deprotonation of hydrazone proton (‐C=N‐NH ‐) was observed. In addition, the limit of detection for P3 :F⁻ and P3 :Cu²⁺ ions were found to be 4.02 μM and 1.64 μM respectively which is useful for practical applications. Lastly, probe P3 was used to detect and quantify the F⁻ ions present in a commercially available mouthwash product. Furthermore, P3 was adsorbed on the surface of silica microsphere to detect Cu²⁺ ions. Interestingly, the material could visually detect 1 ppm of Cu²⁺ ions which is lower than the permissible limit.
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© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim